275676domain: NAppears in sequencesE.g.f.: 1 + log(1+f(x)) where f(x) = log(1/(2-exp(x))) = e.g.f. for A000629.at n=9A075792Numbers k such that k and k^2 use only the digits 2, 5, 6, 7 and 9.at n=34A137112